8.1S water pressure

[BahamasBlair]

What is the normal water pressure on a 8.1S Horizon?
I see zero pressure at idle. 2psi at 1500RPM and 4-5 at 3300 RPM.
Do I need to change the rubber impeller in the pump?
The Smartcraft alarm has started ringing occasionally and puts the engine into Guardian mode.
Thanks for any insight you can offer.

 

[carterchapman]

Mine run 2.0 to 2.7 at idle. Earlier I posted what mine run at all RPMs. I'll look for it or when I'm on my boat next week, I'll repost the numbers...

 

[tbirdvet]

I have 1-1.5 at idle and 12 at 3500 RPM.

 

[my3sons]

I get 2.7 - 2.9 at 650 rpm idle
23+/- at 3500 rpm cruise

 

[66pony]

I hav 1-2 at idle and upwards of 14 at cruise (3400 RPM). Sound like you need to replace your impellers.

 

[JV II]

What is the normal water pressure on a 8.1S Horizon?
I see zero pressure at idle. 2psi at 1500RPM and 4-5 at 3300 RPM.
Do I need to change the rubber impeller in the pump?

Yes. Change the impeller ASAP. Flush out the vanes. All of them.